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IMPROVED KNIFE-SHARPENER TO ALL WHO AIT MAY CONCERNE Be it known that l, GEORGE B. MARKHAM, oi' Plfinouth, Wayne county, Michigan, have invented a new and useful improvement in Grindstones for lfamily use, Sie.; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specifica-tion, in whiche- Figure l. represents my improved portable bevel-edge grindstone, attached to a table, :in a ide view.

Figure 2 represents the same in aback View. v

Figure 3 is a top View; and

Figures 4 and 5 are details enlarged.

Similar letters of reference indicate corresponding parts.

This invention relates to an improvement in the construction of porta-blc griudstones for family use; and consists in hanging a small stone, either natural or artificial, in a'light metal frame, to be attached within setserew to a table or shelf, and provided with a 'crank for turning the stone, thc chief feature of the construction of which is cutting the stone to a. bevel face on the side opposite'the crank for the purpose of allowing articles like table-knives, scissors, &e., to be ground on a small stone without coming-iucorrtaet with the crank.

The great objection to small portable grindstones for family use when made as` usual, with a square face, is that they are rendered almost or quite useless by the Contact of the crank in lturning with the; articles being ground. In this case the crank must be made either too long in the axis for convenience or toosmull for power' and utility. By my improved bevelled form of thevface of a portable stone, this is'- entirely obviated, and a small family grindstone, adapted to general use for domestic purpos, is runde, neat, compact, and convenient. y

A is a small griudstone hung on one end 'of the axis a, to which it is secured by al washer on the inside and a nut ou the outside screwed on the axis. The axis a is set in a light metal frame, having tufo upright branches, b b', formcdwith a clamp, 7l, at the lower part to fit on the' edge of ai table or bench,4 as indicated in' red lines, to which it is secured by a thumb-screw, c. The edge oi' the griudstone on; the. side opposite the Crank g is cut :may at an angle or bevell-ed to make thev face 7c range in. a lille :there the crunk when it is raised, as indicated in red, fig. l. Thus when 'an article like a case-knife is ground en the. bevel face fr, thev crank can be turned without striking it or interfering 'with the operation. An arm, el, is attached to the frame-branch I1, having an adjustable guide-rest, e, ou the eXtremity,Which lies close tothe face: of the stone, and serves the purpose of a bearing for the article to be ground, to hold it steadily and evenly against. the sto-ne.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- The adjustable guide-rest c, attached to the frame-branch by an arm, ci, when constructed as described, and arranged in relation` to the bevelled grindstone A, and its metal supporting-frame, as hereinsct forth for the purpose specified. l

The above speeiiication of my invention signed by me this 26th day of January, 186'?.

' suenen B. MARKHAM.

Witnesses P. G, HALL, J. N. HEBBEN. 

